Malabsorption is a condition where the intestines fail to absorb nutrients effectively, leading to deficiencies in vitamins, minerals, and macronutrients. This is clinically significant as it can result in weight loss, growth failure in children, and various systemic complications due to nutrient deficiencies. A key association is coeliac disease, an autoimmune disorder where ingestion of gluten leads to intestinal damage and subsequent malabsorption.